Beaten 4-0 in the first leg, Barça set out determined to become the first team in UEFA club competition history to overcome that deficit – and their hopes of a famous 'remontada' began taking tangible form when Luis Suárez beat Kevin Trapp to a bouncing ball and headed just over the goal line with less than three minutes gone.Lionel Messi then converted a penalty after Thomas Meunier had blocked Neymar as Barça made a blistering start to the second half to move within a goal of parity, but Edinson Cavani, who had hit the post moments earlier, seemingly put the tie to bed when he blasted high into the net after 62 minutes.That sucked the intensity from the game, Cavani only denied a second by Marc-André Ter Stegen's boot when clean through and Ángel Di María taking too long in another one-on-one. However, Neymar revived the fightback in the 88th minute with a superb free-kick, and then fired in a spot kick after Marquinhos was penalised for impeding Suárez to set up an incredible finale.The hosts required a single goal once again, and had five minutes of added time in which to find it. In the very last of them, Neymar lifted a pass over the defence and substitute Sergi Roberto stabbed in to spark euphoria in the Camp Nou stands.After the euphoria of their 4-0 home win, Paris must now nurse the bitter pain of tonight's 6-1 Camp Nou calamity. This was meant to be a fairly straightforward mission – the tie that proved they had become title candidates – but instead the French champions seem as far away from a maiden UEFA Champions League trophy as ever. Paris will be haunted by this match for a very, very long time, and the inevitable inquest is certain to make harsh reading for Emery and his players. Losses like this come at a cost.